#define sqrt_width 20
#define sqrt_height 11
static unsigned char sqrt_bits[] = {
   0x00, 0xff, 0x0f, 0x00, 0x01, 0x08, 0x00, 0x01, 0x08, 0x80, 0x8c, 0x01,
   0x80, 0x58, 0x01, 0x80, 0x38, 0x00, 0x47, 0x30, 0x00, 0x4c, 0x30, 0x00,
   0x58, 0x78, 0x00, 0x30, 0x6a, 0x01, 0x20, 0xc6, 0x00};

